*{
    margin: 0;
    padding: 0;
    text-decoration: none;
}

body{
    padding: 20px;;
}

#container{
    margin: 0px auto;
    position: relative;
    width:600px;
    height: 400px;
    border: 3px solid #333;
    overflow: hidden;
}

#list{
    position: absolute;
    z-index: 1;
    width: 3000px;
    height: 400px;
}

#list img{
    float: left;
    width: 600px;
    height:400px;
}

#buttons{
    position: absolute;
    left:250px;
    bottom: 20px;
    z-index: 2;
    height: 10px;
    width: 100px;
}

#buttons span{
    float: left;
    margin-right: 5px;
    width: 10px;
    height: 10px;
    border: 1px solid #ffffff;
    border-radius: 50%;
    background: #333333;
    cursor: pointer;
}

#buttons .on{
    background: orangered;
}

.arrow{
    position: absolute;
    top:180px;
    z-index: 2;
    display: none;
    width: 40px;
    height: 40px;
    font-size: 36px;
    font-weight: bold;
    line-height: 39px;
    text-align: center;
    color: #ffffff;
    background-color: RGBA(0,0,0,.3);
}

.arrow:hover{
    background-color: RGBA(0,0,0,.7);
}

#container:hover .arrow{
    display: block;
}

#prev{
    left: 20px;
}

#next{
    right: 20px;
}

